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Dungeon Defenders is 32 bit.
The Binding of Isaac has a .tar.gz download, a 32 bit deb and flash download so I guess all is 32 bit.
No idea about closure, it's .sh installer, could include 64 bit or not.

Legend of Grimrock is 64 bit for me, I guess the installer has a 32 bit version included ("Supported CPU Arch's x86, x86_64").
For Snapshot you can choose between 32 and 64 bit.